Locations for:  Version 3.0 software    

3LOAD:  Unit ID# first eight digits at location 0255
        Service ID# at 0266 (A523)
        Monthly at 0162
        Seed Keys at 2000
        Example - 2000 ** ** ** ** ** ** ** 00 ** ** ** ** ** ** ** 00
                       ** ** ** ** ** ** ** 00 ** ** ** ** ** ** ** 00
        Seven bytes of key then a 00 then seven more then 00 seven more
        then 00 last seven then 00.

THEORY OF OPERATION:
The text keys at 2000 are encrypted by the writer (trap 18) and stored
at 6740 in U-20.  The run chip in turn de-codes them by a reverse trap 
18 and uses the encrypted keys from U-20 to produce the working key. 
This way there is no clear text keys in U-7, U-20, or U-30 to be read
out or copied.  This is the most advanced and secure system we have 
developed to date.  It would take a lot of skull sweat and patience
for anybody to figure it out and steal your ID# and keys.  This is       
3.0 software in the truest sense.
INTERCEPTOR:

LOADCHIP:
The ID# goes in forward at 2A35 first eight digits.
The ID# goes in bacwards at 3FC0. EX. ID# 0185-5E7B-FF12 would be
entered at 3FC0 as  7B 5E 85 01. We only use the first four bytes of 
the ID#. (a byte = two digits so four bytes = 8 digits)
The monthly authorization goes in at 2900 and 2963.

The PPV or RUN chip. 
ID# backwards at 1EBC (First four bytes)
Keys at 1E35 thru 1E50 all 28 bytes in a row.

89WRITER:

ID# Backwards first four bytes at 3FC0.
KEY 00 Starts at 3FC5    KEY 01 Starts at 3FB1
KEY 02 Starts at 3FB9    KEY 03 Starts at 3FA1
Each key has it's identifier before each one.(00,01,02,and 03)
Monthly at 2900 and 2963.
Downloaded From P-80 International Information Systems 304-744-2253